Complex of SARS-CoV-2 nonstructural protein 10 (NSP10), GenBank Accession No. YP_009725306.1, a.a. 1-139(full length), with N-terminal FLAG-tag, MW=16 kDa and SARS-CoV-2 nonstructural protein 16 (NSP16), Genbank Accession No. YP_009725311, a.a. 1-298(full length), with N-terminal His-tag, MW=34 kDa, co-expressed in a HEK293 cell expression system.